Combined ultrahigh vacuum-electrochemistry study of aniline oxidation at oxidized polycrystalline nickel
✍ Scribed by Seshadri, G.; Sarid, R. M.; Kelber, J. A.
- Publisher
- John Wiley and Sons
- Year
- 1999
- Tongue
- English
- Weight
- 125 KB
- Volume
- 27
- Category
- Article
- ISSN
- 0142-2421
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✦ Synopsis
The oxidation of aniline at a polycrystalline Ni electrode in a phosphate buffered solution (pH = 5.8) has been studied by the use of combined ultrahigh vacuum-electrochemistry methodology. XPS analysis shows the presence of a surface bound aniline derived species similar to polyaniline. The amine to imine content of this species is dependent on potential, even though voltammetry shows no redox peaks characteristic of what is conventionally referred to as polyaniline. XPS spectra show the formation of a Ni 3Y species on Ni when it is oxidized in a phosphate buffer solution. This species is not formed when Ni is oxidized in phosphate buffer solutions containing aniline. The overall content of oxidized Ni in the surface layer formed at anodic potentials is lower when Ni is emersed from aniline containing solutions in comparison to emersion from aniline free solutions. Studies of the growth of the surface bound film by a time dependent pulsed potential method show that the growth of surface bound aniline derived polymeric species occurs after a brief induction period during which the growth of nickel oxide occurs. This aniline derived polymer species is found to be approximately five monolayers thick.